Kubo's formula relates bulk viscosity to the retarded Green's function of the trace of the energy-momentum tensor. Using low energy theorems of QCD for the latter we derive the formula which relates the bulk viscosity to the energy density and pressure of hot matter. We then employ the available lattice QCD data to extract the bulk viscosity as a function of temperature. We find that close to t...

Virtual power plant (VPP) is an effective approach to aggregate distributed generation resources under a central control. This paper introduces a mixed-integer linear programming model for optimal scheduling of the internal resources of a large scale VPP in order to maximize its profit. The proposed model studies the effect of a demand response (DR) program on the scheduling of the VPP. The pro...

DC micro-grid is a novel ideal of advanced electricity delivery infrastructure which actively integrates a variety of renewable sources, energy storages, and loads within a local network; this type of lumped system organization can offer a fast, high quality and survivable solution for future residential and industrial power network. DC micro-grids can be the building block of future smart-grid...

Process intensification (PI) technologies represent all approaches leading to size reduction and efficiency improvement of process equipment. Thermal energy storage (TES) systems are key elements in renewable and recovery thermal energy deployments, and their performance can benefit from PI principles. This study covers a brief analysis and state of the art of several PI technologies applied to...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Antti Lajunen Name of the doctoral dissertation Improving the Energy Efficiency and Operating Performance of Heavy Vehicles by Powertrain Electrification Publisher School of Engineering Unit Department of Engineering Design and Production Series Aalto University publication series DOCTORAL DISSERTATIONS 125/2014 Field of resea...